/*
 * Copyright (c) 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.api.client.googleapis.subscriptions;

import java.security.SecureRandom;

/**
 * Utility methods for subscriptions.
 *
 * @author Yaniv Inbar
 * @since 1.13
 */
public class SubscriptionUtils {

  /** Secure random number generator. */
  private static final SecureRandom RANDOM = new SecureRandom();

  /**
   * Generates and returns a new random (based on {@link SecureRandom}) hex-encoded client token
   * with a minimum length of 32 characters.
   */
  public static String generateRandomClientToken() {
    StringBuilder str = new StringBuilder();
    while (str.length() < 32) {
      int num = RANDOM.nextInt();
      str.append(Integer.toHexString(num));
    }
    return str.toString();
  }

  private SubscriptionUtils() {
  }
}
